Cymru vs Severn

Cymru and Severn both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cymru	Yes	No	No	No
Severn	Yes	No	No	No

Cymru (noun)	Severn (noun)
one of the four countries that make up the United Kingdom of Great Britain and Northern Ireland; during Roman times the region was known as Cambria	a river in England and Wales flowing into the Bristol Channel; the longest river in Great Britain
	a river in Ontario that flows northeast into Hudson Bay